my battery draining fast, after marshmallow update.

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Nov 10, 2016 9:26:05 PM via Website

So i installed GSAM battery monitor and saw the processor clock didn't go to a very low state, remaining at ~350khz and that drained the battery. After the october 1, 2016 update (marshmallow version for AT&T on an S5) the clock rate will fairly reliably average ~128khz when the phone is resting (not in doze mode) and significantly improves battery life... for just under 3 days, then the clock rate bumped up to drain the battery faster. I just did a power reset and then it recovered to the lower drain state.
I then got 5 days under light use before getting to 20%. This is pretty much identical to what the phone was doing on lollipop back in january 2016... so 10 months of development on a new OS and they got back to where they started!